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GB1372757A - Prefill valves for moulding machines - Google Patents

Prefill valves for moulding machines

Info

Publication number
GB1372757A
GB1372757A GB392572A GB392572A GB1372757A GB 1372757 A GB1372757 A GB 1372757A GB 392572 A GB392572 A GB 392572A GB 392572 A GB392572 A GB 392572A GB 1372757 A GB1372757 A GB 1372757A
Authority
GB
United Kingdom
Prior art keywords
main
ram
cavity
poppet
jack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB392572A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Industries Inc
Original Assignee
US Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by US Industries Inc filed Critical US Industries Inc
Publication of GB1372757A publication Critical patent/GB1372757A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/67—Mould opening, closing or clamping devices hydraulic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/223—Injection mold closing means utilizing variable closing pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

1372757 Mould closing devices US INDUSTRIES Inc 27 Jan 1972 [2 Feb 1971] 3925/72 Heading B5A The invention relates to a moulding machine having main and pilot hydraulic circuits, a main ram 6 in a main cylinder 2 for opening and closing a mould (not shown), a jack ram cavity 10 in the main ram, a stationary jack ram 11 extending into the cavity 10 and mounted at the other end on a support 3, an hydraulic fluid reservoir which is in communication with the main ram cavity 22 when the main ram is retracted, and a bore 14 extending through the jack ram through which main hydraulic pressure can act to move the main ram to the advanced position. According to the invention the machine comprises a prefill valve assembly including a valve cylinder 4 extending between the main cylinder 2 and the jack ram support 3, a poppet 20 reciprocable in the cylinder 4 between positions opening and closing connection between the fluid reservoir and the main ram cavity 22, means for urging the poppet towards open position and means for directing main hydraulic circuit pressure against an end of the poppet for closing it. The use of main hydraulic fluid pressure produces very rapid closing of the poppet, thereby reducing the total cycle time of the machine. The invention is applied to an injection moulding machine, one mould half (not shown) being mounted on a platen 7 secured to the main ram 2. The hydraulic system includes a profile control valve 40 and a ram control valve 41. The valves 40, 41 include pilot valves 42, 44 and main valves 43, 45 respectively. Operation.-The platen 7 and main ram 6 are advanced rapidly by main hydraulic pressure supplied through lines 69, 80, 77, 75 and bores 13, 14 into the jack ram cavity 10. When the ram 6 has reached its advanced position fluid pressure builds up inside the jack ram and is transmitted through a port 33 to a seat 30 on the poppet 20 which is thereby moved to the right to cut off the connection between cavity 22 and the reservoir. Main pressure is then supplied through bore 13, port 33 and an annular space 38 between poppet 20 and support 3 to the cavity 22 so as to apply full pressure to the main ram 6.
GB392572A 1971-02-02 1972-01-27 Prefill valves for moulding machines Expired GB1372757A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11192971A 1971-02-02 1971-02-02

Publications (1)

Publication Number Publication Date
GB1372757A true GB1372757A (en) 1974-11-06

Family

ID=22341192

Family Applications (1)

Application Number Title Priority Date Filing Date
GB392572A Expired GB1372757A (en) 1971-02-02 1972-01-27 Prefill valves for moulding machines

Country Status (8)

Country Link
US (1) US3781160A (en)
AU (1) AU3807972A (en)
BR (1) BR7200433D0 (en)
DE (1) DE2204931A1 (en)
ES (1) ES399235A1 (en)
FR (1) FR2124398A1 (en)
GB (1) GB1372757A (en)
IT (1) IT948404B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941549A (en) * 1974-06-26 1976-03-02 Jacobs Arthur W Reciprocating screw injection molding machine with hydraulic actuating mechanism with prefill valve
US3905742A (en) * 1974-09-30 1975-09-16 Beloit Corp Valve for an injection molding machine
DE3107004C2 (en) * 1981-02-25 1985-11-28 Krauss-Maffei AG, 8000 München Mold clamping device
US4922716A (en) * 1988-01-13 1990-05-08 Cincinnati Milacron Inc. Throttled exhaust outlet to reservoir for reducing noise resulting from release hydraulic pressure surges
CN115674608B (en) * 2023-01-03 2023-05-09 山西斯普瑞机械制造股份有限公司 Valve special for automatically adjusting opening and closing die of shoe vulcanizing machine

Also Published As

Publication number Publication date
AU3807972A (en) 1973-07-26
ES399235A1 (en) 1974-12-16
BR7200433D0 (en) 1973-05-03
IT948404B (en) 1973-05-30
US3781160A (en) 1973-12-25
DE2204931A1 (en) 1972-11-02
FR2124398A1 (en) 1972-09-22

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed